When George Augustus became King George II, his titles changed in the following way:

Before becoming King:

• He was Prince George Augustus, Duke of Brunswick-Lüneburg.
• Also titled the Prince of Wales, as heir apparent to the British throne.

After becoming King:

• He assumed the title King George II of Great Britain and Ireland.
• He was also recognized as the Duke of Brunswick-Lüneburg and a Prince-elector of the Holy Roman Empire.

The shift signified his elevation from heir apparent to reigning monarch, along with the associated responsibilities and sovereign powers.